NCT24DR2 [ETC]
;
| 型号： | NCT24DR2 |
| 厂家： | 
ETC |
| 描述： |
|
| 文件： | 总8页 (文件大小：56K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NCT22, NCT24
Low Cost Single Trip Point
Temperature Sensor
The NCT22 and NCT24 are programmable solid state temperature
sensors designed to replace mechanical switches in sensing and
control applications. Both devices integrate the temperature sensor
with a voltage reference and all required detector circuitry. The desired
temperature set point is set by the user with a single external resistor.
Ambient temperature is sensed and compared to the programmed
setpoint. The OUT and OUT outputs are driven to their active state
when the measured temperature exceeds the programmed setpoint.
The NCT22 has a power supply voltage range of 4.5 V to 18 V
while the NCT24 operates over a power supply range of 2.7 V to 4.5 V.
Both devices are useable over a temperature range of –40°C to
+125°C. Both devices feature low supply current making them
suitable for many portable applications.
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MARKING
DIAGRAM
8
SOIC–8
D SUFFIX
CASE 751
8
NCTxx
ALYW
1
1
xx = 22 or 24
The devices are offered in surface mount packages.
A
L
Y
W
= Assembly Location
= Wafer Lot
= Year
Features
• Temperature Set Point Easily Programs with a Single External
Resistor
= Work Week
• Operates with 2.7 V Power Supply (NCT24)
• Small SOIC Package
• Cost Effective
PIN CONNECTIONS
N/C
1
2
8
7
N/C
OUT
V
DD
Applications
NCT22
NCT24
• Power Supply Over–Temperature Detection
• Consumer Electronics
OUT
GND
3
4
6
5
N/C
T
SET
• Fire/Heat Detection
• UPSs, Amplifiers, Motors
• CPU Thermal Management in PCs
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
+9 V
+
Sounder
9 V
Sensor
Battery
R
SET
–
NCT22
NC
1
7
8
V
CONTROL
ASIC
DD
5
T
SET
NC
OUT
6
4
3
2
NC
GND OUT
ALARM
Figure 1. Heat Monitor for Smoke Detector
Semiconductor Components Industries, LLC, 2000
1
Publication Order Number:
December, 2000 – Rev. 0
NCT22/D
NCT22, NCT24
ABSOLUTE MAXIMUM RATINGS*
Rating
Symbol
Value
Unit
Supply Voltage
NCT22
V
CC
V
20
NCT24
5.5
Input Voltage (Any Input)
–
GND –0.3 to V +0.3
V
DD
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
–40 to +125
+150
°C
°C
°C
°C
–
–
T
stg
–65 to +150
+300
Lead Temperature (Soldering, 10 seconds)
–
*Stresses above those listed under “Absolute Maximum Ratings’’ may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications
is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, unless otherwise specified)
Characteristics
Device
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
Range
NCT22
NCT24
–
4.5
2.7
–
–
18
4.5
V
Supply Current
NCT22
NCT24
–
–
200
170
600
300
µA
5.0 V v V v 18 V
DD
2.7 V v V v 4.5 V
DD
V
NCT22
NCT22
V
OH
OL
5.0 V v V v 18 V
DD
–40°C v T v +125°C
A
0.9 x V
0.8 x V
–
–
–
–
DD
DD
I
I
= 250 µA
= 500 µA
OH
OH
V
V
–40°C v T v +85°C
A
–
–
–
–
0.15 x V
0.30 x V
DD
DD
I
OL
= 500 µA
I
OL
= 1.0 mA
–40°C v T v +125°C
A
–
–
0.35 x V
DD
I
OL
= 1.0 mA
V
V
NCT24
NCT24
V
V
OH
2.7 V v V v 4.5 V
DD
–40°C v T v +125°C
A
0.9 x V
0.8 x V
–
–
–
–
DD
DD
I
I
= 250 µA
= 500 µA
OH
OH
OL
–40°C v T v +85°C
A
–
–
–
–
0.1 x V
0.2 x V
DD
DD
I
OL
= 500 µA
I
OL
= 1.0 mA
–40°C v T v +125°C
A
–
–
0.25 x V
DD
I
OL
= 1.0 mA
Absolute Accuracy
NCT22
NCT24
T
SET
T
SET
= Programmed Temperature
= Programmed Temperature
T–5
T–5
T+5
T+5
°C
°C
T"1
T"1
Trip Point Hysteresis
NCT22
NCT24
–
–
–
2.0
2.0
–
–
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2
NCT22, NCT24
Hysteresis
DETAILED DESCRIPTION
To prevent output “chattering’’ at the trip point
temperature, the temperature detector in the NCT22/24 has
2°C of hysteresis (see Figure 3).
The outputs are driven active when the temperature
crosses the setpoint determined by the external resistor. As
temperature declines below the setpoint, the hysteresis
action will hold the outputs true until the temperature drops
2°C below the threshold.
Trip Point Programming
The NCT22 and NCT24 are single point temperature
detectors ideal for use in a wide variety of applications.
When the temperature of the device exceeds the
programmed temperature trip point, T , the OUT and
OUT outputs are driven into their active states. The desired
trip point temperature is programmed with a single external
SET
resistor connected between the T
input and V . The
SET
CC
relationship between the resistor value and the trip point
temperature is given by the equation below.
TEMPERATURE
2.1312
+ 0.5997 T
Where Rtrip + Programming resistor value in Ohms
R
SET POINT
(SET POINT–2°C)
TRIP
T = Desired trip temperature in degrees Kelvin.
OUT
For example, to program the device to trip at 50°C, the
programming resistor is:
2.1312
R
+ 0.5997 ((50 ) 273.15)
) + 133, 652 W
TRIP
250
OUT
Figure 3. NCT22/24 Hysteresis
200
150
100
50
APPLICATIONS
Over–Temperature Shutdown
The NCT22 can be used to create
a simple
over–temperature shutdown circuit. In this circuit,
temperature is sensed within the system enclosure (internal
system ambient), or at the heatsink itself. When measured
temperature exceeds a preset limit, a fault is indicated and
the system shuts down.
Figure 4 illustrates a simple over–temperature shutdown
circuit using the NCT22 sensor. As shown, the NCT22
outputs are driven active when the heatsink temperature
–55 –35 –15
5
25
45
65
85 105 125
TEMPERATURE (°C)
Figure 2. Programming Resistor Values
vs. Temperature
equals the trip point temperature set by R . When this
SET
happens, the crowbar circuit is activated, causing the supply
output to fold back to zero. The NCT22 outputs remain
active until the heatsink temperature falls a minimum of 2°C
(built–in hysteresis) below the trip point temperature, at
which time the device again allows normal supply operation.
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3
NCT22, NCT24
V
CC
V
OUT
OUTPUT DEVICE
POWER
GOOD
SIGNAL
R
SET
NCT22
CROWBAR
CIRCUIT
T
V
DD
SET
OVERTEMP
OUT
GND OUT
HEATSINK SURFACE
Figure 4. NCT22 Power Supply Over–Temperature Shutdown
Cooling and Heating Applications
The NCT22/24 can be used to control a DC fan as shown
in Figure 5. The fan turns on when the sensed temperature
Figure 6 shows the NCT22 acting as a heater thermostat.
Circuit operation is identical to that of the cooling fan
application.
rises above T
and remains on until the temperature falls
SET
below T
–2°C.
SET
+2.7 to 4.5 V
+12 V
+4.5 to 18.0 V +12 V
R
R
SET
SET
HEATER
+
–
1
7
1
5
7
8
DC FAN
NC
V
NC
V
DD
DD
5
8
3
T
SET
NC
T
SET
NC
N–CHANNEL
LOGIC
LEVEL
MOSFET
NCT24
NCT22
6
4
6
4
NC
OUT
NC
OUT
N–CHANNEL
LOGIC
LEVEL
MOSFET
2
GND
OUT
GND
OUT
T
T
SET
T
T
SET
–2°C
SET
–2°C
SET
OUT
OUT
HEATER “ON”
FAN “ON”
Figure 5. NCT24 As a Fan Controller for Notebook PCs
Figure 6. NCT22 As a Heater Thermostat
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4
NCT22, NCT24
ORDERING INFORMATION
Package
Voltage
Operation
Ambient
Temperature
Device
Shipping
NCT22DR2
NCT24DR2
4.5 V to 18 V
2.7 V to 4.5 V
SOIC–8
SOIC–8
–40°C to +125°C
–40°C to +125°C
2500 Units Tape and Reel
2500 Units Tape and Reel
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5
NCT22, NCT24
Notes
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6
NCT22, NCT24
PACKAGE DIMENSIONS
SO–8
D SUFFIX
CASE 751–07
ISSUE V
–X–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
A
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN
EXCESS OF THE D DIMENSION AT MAXIMUM
MATERIAL CONDITION.
8
5
4
S
M
M
B
0.25 (0.010)
Y
1
K
–Y–
G
MILLIMETERS
DIM MIN MAX
INCHES
MIN
MAX
0.197
0.157
0.069
0.020
A
B
C
D
G
H
J
4.80
3.80
1.35
0.33
5.00 0.189
4.00 0.150
1.75 0.053
0.51 0.013
C
N X 45
_
SEATING
PLANE
–Z–
1.27 BSC
0.050 BSC
0.10 (0.004)
0.10
0.19
0.40
0
0.25 0.004
0.25 0.007
1.27 0.016
0.010
0.010
0.050
8
M
J
H
D
K
M
N
S
8
0
_
_
_
_
0.25
5.80
0.50 0.010
6.20 0.228
0.020
0.244
M
S
S
X
0.25 (0.010)
Z
Y
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7
NCT22, NCT24
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
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attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
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NCT22/D
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